/* =========================================================
   泛音 Overtone — official site
   Zero dependency · static · dark
   ========================================================= */

:root {
  --bg: #05070d;
  --bg-soft: #070a12;
  --panel: #0a0f1a;
  --panel-2: #0c121f;
  --line: rgba(146, 174, 226, .13);
  --line-strong: rgba(146, 174, 226, .26);
  --text: #e9eef9;
  --text-2: #b6c2d8;
  --muted: #939fb6;
  --dim: #74819a;
  --blue: #5b8cff;
  --blue-soft: #8fb4ff;
  --cyan: #8fd8ff;
  --violet: #a78bfa;
  --grad: linear-gradient(100deg, #8fd8ff 0%, #6f8dff 48%, #a78bfa 100%);
  --font: "MiSans", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", Consolas, "Liberation Mono", monospace;
  --container: 1200px;
  --pad: 32px;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .01em;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body.menu-open, body.lightbox-open { overflow: hidden; }

h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; }
img, svg { max-width: 100%; }
button, input { font: inherit; color: inherit; }
a { color: inherit; }
::selection { background: rgba(91, 140, 255, .35); color: #fff; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--pad); }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: fixed; top: 12px; left: 12px; z-index: 200;
  padding: 10px 16px; border-radius: 8px;
  background: var(--blue); color: #fff; font-size: 13px;
  text-decoration: none; transform: translateY(-160%);
  transition: transform .2s;
}
.skip-link:focus { transform: none; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 3px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  height: 48px; padding: 0 22px;
  border: 1px solid transparent; border-radius: 8px;
  font-size: 14px; font-weight: 500; letter-spacing: .02em;
  text-decoration: none; white-space: nowrap; cursor: pointer;
  transition: transform .2s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.btn svg { width: 15px; height: 15px; flex: none; }
.btn--primary {
  background: linear-gradient(100deg, #6f9dff, #7f7cf6);
  color: #fff;
  box-shadow: 0 10px 30px -12px rgba(91, 140, 255, .75), inset 0 1px 0 rgba(255,255,255,.18);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 38px -12px rgba(111, 124, 246, .9); }
.btn--ghost {
  background: rgba(255, 255, 255, .02);
  border-color: var(--line-strong);
  color: var(--text-2);
}
.btn--ghost:hover { border-color: rgba(143, 216, 255, .5); color: #fff; background: rgba(143, 216, 255, .06); }
.btn--sm { height: 40px; padding: 0 17px; font-size: 13px; }

code, kbd {
  font-family: var(--mono);
  font-size: .86em;
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(146, 174, 226, .06);
  color: var(--blue-soft);
}
kbd { font-size: .78em; padding: 1px 5px; }

/* ---------- header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 72px;
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
}
.site-header.is-scrolled {
  background: rgba(5, 7, 13, .82);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
.nav {
  height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand {
  display: inline-flex; align-items: center; gap: 11px;
  text-decoration: none; flex: none;
}
.brand__mark { width: 30px; height: 30px; border-radius: 7px; object-fit: cover; display: block; }
.brand__text {
  display: flex; align-items: baseline; gap: 9px;
  font-size: 19px; font-weight: 500; letter-spacing: .06em; color: #f2f5ff;
}
.brand__en { font: 500 8.5px/1 var(--mono); letter-spacing: .2em; color: var(--dim); }

.nav__menu { display: flex; align-items: center; gap: 34px; }
.nav__list { display: flex; align-items: center; gap: 30px; list-style: none; }
.nav__link {
  position: relative; display: inline-flex; align-items: center; gap: 5px;
  font-size: 13.5px; color: var(--muted); text-decoration: none;
  transition: color .2s ease;
}
.nav__link::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -8px;
  height: 1px; background: var(--grad);
  transform: scaleX(0); transform-origin: left; transition: transform .25s ease;
}
.nav__link:hover { color: var(--text); }
.nav__link.is-active { color: #fff; }
.nav__link.is-active::after { transform: scaleX(1); }
.nav__link svg { width: 11px; height: 11px; opacity: .6; }
.nav__link--ghost svg { transition: opacity .2s; }
.nav__link--ghost:hover svg { opacity: 1; }
.nav__cta { flex: none; }
.nav__foot { display: none; }

.nav-toggle {
  display: none; width: 40px; height: 40px; flex: none;
  border: 1px solid var(--line); border-radius: 8px;
  background: rgba(255,255,255,.02); cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle__line { display: block; width: 17px; height: 1.4px; background: var(--text-2); transition: transform .25s, opacity .25s; }
.site-header.menu-open .nav-toggle__line:first-child { transform: translateY(3.2px) rotate(45deg); }
.site-header.menu-open .nav-toggle__line:last-child { transform: translateY(-3.2px) rotate(-45deg); }

/* ---------- reveal ---------- */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; transition-delay: var(--delay, 0s); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- section basics ---------- */
.section { padding: 112px 0; position: relative; }
.section-label {
  display: flex; align-items: center; gap: 12px;
  font: 500 9px/1 var(--mono); letter-spacing: .2em; color: var(--dim);
  text-transform: uppercase; white-space: nowrap;
}
.section-label::after { content: ""; width: 30px; height: 1px; background: var(--line-strong); }
.section-label__num { color: var(--blue-soft); }

.display-2 {
  font-size: clamp(30px, 4.2vw, 48px);
  font-weight: 300; line-height: 1.35; letter-spacing: .005em; color: #f2f5ff;
}

.section-head { display: grid; grid-template-columns: 200px 1fr; gap: 48px; margin-bottom: 72px; }
.section-head__main { max-width: 720px; }
.section-head__lede { margin-top: 22px; font-size: 15px; line-height: 1.95; color: var(--muted); max-width: 620px; }
.section-head--split { display: flex; align-items: flex-end; justify-content: space-between; gap: 60px; }
.section-head--split .section-label { margin-bottom: 24px; }
.section-head--split .section-head__lede { max-width: 420px; margin-top: 0; }

/* =========================================================
   HERO — particle typography
   ========================================================= */
.hero {
  position: relative;
  min-height: 760px;
  height: 100svh;
  overflow: hidden;
  isolation: isolate;
}
.hero__bg { position: absolute; inset: 0; z-index: -2; pointer-events: none; }
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(146, 174, 226, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(146, 174, 226, .045) 1px, transparent 1px);
  background-size: 78px 78px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 42%, #000 5%, transparent 72%);
  mask-image: radial-gradient(ellipse at 50% 42%, #000 5%, transparent 72%);
}
.hero__glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; }
.hero__glow--a { width: 700px; height: 460px; left: -10%; top: 8%; background: radial-gradient(circle, rgba(59, 106, 220, .32), transparent 70%); }
.hero__glow--b { width: 620px; height: 460px; right: -8%; top: 22%; background: radial-gradient(circle, rgba(120, 76, 220, .28), transparent 70%); }

.hero__stage { position: absolute; inset: 0; z-index: -1; }
.hero__canvas { display: block; width: 100%; height: 100%; opacity: 0; transition: opacity .6s ease; }
.hero__stage.has-particles .hero__canvas { opacity: 1; }

.hero__fallback {
  position: absolute; left: 0; right: 0; top: 24%;
  text-align: center;
  font-size: clamp(110px, 22vw, 280px);
  font-weight: 700; line-height: 1.2; letter-spacing: .04em;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  filter: drop-shadow(0 0 60px rgba(91, 140, 255, .35));
}
/* keep the h1 in the accessibility tree but visually replaced by the canvas */
.hero__stage.has-particles .hero__fallback {
  opacity: 0; pointer-events: none;
  clip-path: inset(50%);
  background: none; -webkit-text-fill-color: currentColor;
}
.hero__ghost {
  position: absolute; left: 0; right: 0; top: 20%;
  text-align: center;
  font: 400 clamp(60px, 12vw, 150px)/1 var(--mono);
  letter-spacing: .12em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(143, 180, 255, .07);
  opacity: .8; pointer-events: none;
}

.hero__inner {
  position: relative; z-index: 2;
  height: 100%; padding-top: 116px; padding-bottom: 96px;
  display: flex; flex-direction: column; justify-content: space-between;
  pointer-events: none;
}
.hero__inner a, .hero__inner button { pointer-events: auto; }
.hero__top { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font: 500 9.5px/1 var(--mono); letter-spacing: .2em; color: var(--text-2);
}
.eyebrow__dot {
  width: 5px; height: 5px; border-radius: 50%; background: var(--cyan);
  box-shadow: 0 0 10px rgba(143, 216, 255, .9);
}
.version-badge {
  padding: 7px 12px; border: 1px solid var(--line-strong); border-radius: 999px;
  background: rgba(146, 174, 226, .04);
  font: 400 9px/1 var(--mono); letter-spacing: .1em; color: var(--blue-soft);
}

.hero__bottom { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; }
.hero__copy { max-width: 640px; }
.hero__lede {
  font-size: clamp(15px, 1.35vw, 17px); line-height: 2; color: var(--text-2);
  text-shadow: 0 2px 30px rgba(5, 7, 13, .9);
}
.hero__actions { display: flex; align-items: center; gap: 12px; margin-top: 30px; flex-wrap: wrap; }
.hero__meta {
  display: flex; align-items: center; list-style: none; gap: 0;
  margin-top: 32px; font: 400 9px/1 var(--mono); letter-spacing: .14em; color: var(--dim);
}
.hero__meta li + li::before { content: "/"; margin: 0 14px; color: rgba(146, 174, 226, .35); }

/* shape switcher only makes sense when particles are actually running */
.hero__controls { display: none; flex-direction: column; align-items: flex-end; gap: 14px; flex: none; }
.particles-on .hero__controls { display: flex; }
.hero__hint {
  display: inline-flex; align-items: center; gap: 8px;
  font: 400 9px/1 var(--mono); letter-spacing: .1em; color: var(--dim);
}
.hero__hint-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--violet); box-shadow: 0 0 8px rgba(167,139,250,.8); }
.shapes {
  display: flex; align-items: center; gap: 2px; padding: 4px;
  border: 1px solid var(--line); border-radius: 9px;
  background: rgba(8, 12, 20, .6);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.shape {
  padding: 8px 14px; border: 0; border-radius: 6px;
  background: transparent; color: var(--dim);
  font: 400 10px/1 var(--mono); letter-spacing: .08em; cursor: pointer;
  transition: background .2s, color .2s;
}
.shape:hover { color: var(--text-2); }
.shape.is-active { background: rgba(111, 141, 255, .16); color: #dbe6ff; box-shadow: inset 0 0 0 1px rgba(143,180,255,.22); }

.scroll-cue {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  z-index: 3; display: flex; flex-direction: column; align-items: center; gap: 10px;
  font: 400 8px/1 var(--mono); letter-spacing: .24em; color: var(--dim);
  text-decoration: none;
}
.scroll-cue i { display: block; width: 1px; height: 34px; background: linear-gradient(var(--blue-soft), transparent); }

/* ---------- spec strip ---------- */
.spec-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(8, 12, 20, .55); }
.spec-strip__inner { display: grid; grid-template-columns: repeat(4, 1fr); }
.spec {
  display: flex; flex-direction: column; gap: 9px;
  padding: 26px 0 26px 28px; border-left: 1px solid var(--line);
}
.spec:first-child { border-left: 0; padding-left: 0; }
.spec__k { font: 500 8px/1 var(--mono); letter-spacing: .18em; color: var(--blue-soft); }
.spec__v { font-size: 14px; color: var(--text-2); }

/* ---------- about ---------- */
.about__grid { display: grid; grid-template-columns: 200px 1fr; gap: 48px; }
.about__content { max-width: 860px; }
.about__cols { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin: 44px 0 52px; }
.about__cols p { font-size: 14.5px; line-height: 2; color: var(--muted); }
.about__cols .lede { font-size: 16.5px; line-height: 1.95; color: var(--text-2); }

.lineage {
  display: grid; grid-template-columns: 1fr 28px 1fr; gap: 20px; align-items: center;
  padding: 30px; border: 1px solid var(--line); border-radius: 14px;
  background: linear-gradient(120deg, rgba(91, 140, 255, .05), rgba(167, 139, 250, .04));
}
.lineage__item { min-width: 0; }
.lineage__tag { display: block; margin-bottom: 12px; font: 400 8px/1 var(--mono); letter-spacing: .14em; color: var(--blue-soft); }
.lineage__item strong { display: block; margin-bottom: 10px; font-size: 22px; font-weight: 500; color: #f2f5ff; }
.lineage__item p { font-size: 12.5px; line-height: 1.85; color: var(--muted); }
.lineage__plus { text-align: center; font: 300 24px/1 var(--mono); color: var(--dim); }

.about__facts { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 52px; }
.fact { padding: 24px 24px 0 0; border-right: 1px solid var(--line); }
.fact:last-child { border-right: 0; }
.fact dt { margin-bottom: 10px; font: 500 8.5px/1 var(--mono); letter-spacing: .16em; color: var(--blue-soft); }
.fact dd { font-size: 13px; line-height: 1.9; color: var(--muted); max-width: 240px; }

/* ---------- features ---------- */
.feature-wide {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
  padding: 44px 0; border-top: 1px solid var(--line);
}
.feature-wide--split { border-bottom: 1px solid var(--line); }
.feature__num { display: block; margin-bottom: 18px; font: 500 9px/1 var(--mono); letter-spacing: .18em; color: var(--blue-soft); }
.feature-wide__copy h3 { margin-bottom: 18px; font-size: 27px; font-weight: 400; color: #f2f5ff; }
.feature-wide__copy p { font-size: 14.5px; line-height: 2; color: var(--muted); }
.feature__note { margin-top: 18px !important; font: 400 9px/1.7 var(--mono) !important; letter-spacing: .04em; color: var(--dim) !important; }

.visual-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.visual-list span {
  display: grid; place-items: center; min-height: 60px;
  border: 1px solid var(--line); border-radius: 8px;
  background: linear-gradient(160deg, rgba(91, 140, 255, .07), rgba(167, 139, 250, .04));
  font-size: 14px; color: var(--text-2);
  transition: border-color .2s, color .2s, transform .2s;
}
.visual-list span:nth-child(3n) { background: linear-gradient(160deg, rgba(143, 216, 255, .08), rgba(91, 140, 255, .04)); }
.visual-list span:hover { border-color: rgba(143, 216, 255, .45); color: #fff; transform: translateY(-2px); }

.backdrop-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.backdrop-list span {
  display: flex; align-items: flex-end; height: 92px; padding: 12px;
  border: 1px solid var(--line); border-radius: 9px;
  font-size: 13px; color: var(--text-2);
  transition: border-color .2s, transform .2s;
}
.backdrop-list span:nth-child(1) { background: linear-gradient(150deg, rgba(91,140,255,.22), rgba(10,15,26,.9)); }
.backdrop-list span:nth-child(2) { background: linear-gradient(150deg, rgba(167,139,250,.24), rgba(120,90,180,.08)); }
.backdrop-list span:nth-child(3) { background: linear-gradient(150deg, rgba(143,216,255,.18), rgba(10,20,34,.9)); }
.backdrop-list span:nth-child(4) { background: linear-gradient(150deg, rgba(80,110,180,.16), rgba(6,9,16,.9)); }
.backdrop-list span:nth-child(5) { background: linear-gradient(150deg, rgba(110,90,200,.2), rgba(8,10,22,.9)); }
.backdrop-list span:nth-child(6) { background: rgba(255,255,255,.015); }
.backdrop-list span:hover { border-color: rgba(143, 216, 255, .45); transform: translateY(-2px); }

.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 40px; }
.fcard {
  padding: 28px 24px 26px; border: 1px solid var(--line); border-radius: 12px;
  background: linear-gradient(180deg, rgba(12, 18, 31, .8), rgba(7, 11, 19, .6));
  transition: border-color .25s, transform .25s, background .25s;
}
.fcard:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.fcard__num { display: block; margin-bottom: 22px; font: 500 9px/1 var(--mono); letter-spacing: .18em; color: var(--blue-soft); }
.fcard h3 { margin-bottom: 12px; font-size: 17px; font-weight: 500; color: #f2f5ff; }
.fcard p { font-size: 13px; line-height: 1.9; color: var(--muted); }
.fcard__tag { display: block; margin-top: 20px; font: 400 8.5px/1 var(--mono); letter-spacing: .06em; color: var(--dim); }
.feature__disclaimer {
  margin-top: 30px; padding: 14px 18px;
  border-left: 2px solid rgba(167, 139, 250, .55);
  background: rgba(167, 139, 250, .045);
  font-size: 12.5px; line-height: 1.9; color: var(--muted);
}

/* ---------- gallery ---------- */
.gallery__filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.filter {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 15px; border: 1px solid var(--line); border-radius: 999px;
  background: transparent; color: var(--muted); font-size: 12.5px; cursor: pointer;
  transition: color .2s, border-color .2s, background .2s;
}
.filter span { font: 400 9px/1 var(--mono); color: var(--dim); }
.filter:hover { color: var(--text); border-color: var(--line-strong); }
.filter.is-active { color: #fff; border-color: rgba(143, 180, 255, .45); background: rgba(111, 141, 255, .13); }
.filter.is-active span { color: var(--blue-soft); }

.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.shot {
  margin: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  background: var(--panel);
  transition: border-color .25s, transform .25s, box-shadow .25s;
}
.shot:hover { border-color: var(--line-strong); transform: translateY(-3px); box-shadow: 0 30px 60px -30px rgba(0,0,0,.95); }
.shot.is-hidden { display: none; }
.shot__open {
  display: block; position: relative; width: 100%; padding: 0; border: 0;
  background: #0b1020; cursor: zoom-in; overflow: hidden;
}
.shot__open img { display: block; width: 100%; height: auto; aspect-ratio: 1280 / 828; object-fit: cover; transition: transform .5s ease; }
.shot:hover .shot__open img { transform: scale(1.025); }
.shot__zoom {
  position: absolute; right: 12px; top: 12px;
  display: grid; place-items: center; width: 30px; height: 30px;
  border: 1px solid rgba(255,255,255,.25); border-radius: 7px;
  background: rgba(5, 7, 13, .7); color: #fff;
  opacity: 0; transform: translateY(-4px); transition: opacity .25s, transform .25s;
}
.shot__zoom svg { width: 14px; height: 14px; }
.shot:hover .shot__zoom, .shot__open:focus-visible .shot__zoom { opacity: 1; transform: none; }
.shot figcaption { display: flex; flex-direction: column; gap: 4px; padding: 15px 18px 18px; }
.shot figcaption strong { font-size: 14px; font-weight: 500; color: #f2f5ff; }
.shot figcaption span { font-size: 12px; line-height: 1.7; color: var(--muted); }
.gallery__caption { margin-top: 26px; font: 400 9.5px/1.8 var(--mono); letter-spacing: .06em; color: var(--dim); }

/* ---------- lightbox ---------- */
.lightbox { position: fixed; inset: 0; z-index: 300; }
.lightbox[hidden] { display: none; }
.lightbox__backdrop { position: absolute; inset: 0; background: rgba(3, 5, 10, .92); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
.lightbox__inner { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; padding: 60px 90px 92px; }
.lightbox__img {
  max-width: 100%; max-height: 100%; width: auto; height: auto;
  border: 1px solid var(--line-strong); border-radius: 8px;
  box-shadow: 0 40px 100px -30px rgba(0,0,0,.95);
}
.lightbox__close, .lightbox__nav {
  position: absolute; display: grid; place-items: center;
  border: 1px solid var(--line-strong); border-radius: 9px;
  background: rgba(12, 18, 31, .9); color: var(--text-2); cursor: pointer;
  transition: color .2s, border-color .2s, background .2s;
}
.lightbox__close:hover, .lightbox__nav:hover { color: #fff; border-color: var(--cyan); background: rgba(91,140,255,.18); }
.lightbox__close { top: 22px; right: 22px; width: 40px; height: 40px; }
.lightbox__close svg { width: 18px; height: 18px; }
.lightbox__nav { top: 50%; transform: translateY(-50%); width: 44px; height: 56px; }
.lightbox__nav svg { width: 20px; height: 20px; }
.lightbox__nav--prev { left: 22px; }
.lightbox__nav--next { right: 22px; }
.lightbox__bar {
  position: absolute; left: 90px; right: 90px; bottom: 26px;
  display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
}
.lightbox__bar strong { font-size: 14px; font-weight: 500; color: #f2f5ff; }
.lightbox__bar > span:not(.lightbox__count) { font-size: 12.5px; color: var(--muted); }
.lightbox__count { margin-left: auto; font: 400 10px/1 var(--mono); letter-spacing: .12em; color: var(--dim); }

/* ---------- philosophy ---------- */
.philosophy { overflow: hidden; }
.philosophy__bg {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse at 25% 30%, rgba(91, 140, 255, .1), transparent 55%),
              radial-gradient(ellipse at 80% 75%, rgba(167, 139, 250, .09), transparent 55%);
}
.philosophy__quote {
  position: relative; margin: 46px 0 76px;
  font-size: clamp(30px, 5.2vw, 60px); font-weight: 300; line-height: 1.4;
  letter-spacing: .01em; color: #f2f5ff;
}
.philosophy__quote::before { content: ""; display: block; width: 52px; height: 2px; margin-bottom: 36px; background: var(--grad); }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); }
.principle { padding: 26px 30px 0 0; border-right: 1px solid var(--line); position: relative; }
.principle:last-child { border-right: 0; }
.principle__time { font: 400 9px/1 var(--mono); letter-spacing: .16em; color: var(--blue-soft); }
.principle h3 { margin: 20px 0 12px; font-size: 19px; font-weight: 400; color: #f2f5ff; }
.principle p { font-size: 13px; line-height: 1.9; color: var(--muted); max-width: 300px; }

/* ---------- guide ---------- */
.guide__grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 90px; }
.guide__intro .display-2 { margin: 30px 0 26px; }
.guide__intro > p { max-width: 400px; font-size: 15px; line-height: 2; color: var(--muted); }
.guide__links { display: flex; gap: 22px; margin-top: 30px; }
.guide__links a {
  display: inline-flex; align-items: center; gap: 6px;
  font: 400 10px/1 var(--mono); letter-spacing: .08em; color: var(--blue-soft);
  text-decoration: none; border-bottom: 1px solid rgba(143, 180, 255, .3); padding-bottom: 5px;
  transition: color .2s, border-color .2s;
}
.guide__links svg { width: 12px; height: 12px; }
.guide__links a:hover { color: #fff; border-color: #fff; }
.steps { list-style: none; border-top: 1px solid var(--line); }
.step { display: grid; grid-template-columns: 48px 1fr; gap: 20px; align-items: start; padding: 26px 0; border-bottom: 1px solid var(--line); }
.step__num { font: 500 11px/1.6 var(--mono); letter-spacing: .1em; color: var(--blue-soft); }
.step__body h3 { margin-bottom: 10px; font-size: 17px; font-weight: 500; color: #f2f5ff; }
.step__body p { font-size: 13.5px; line-height: 1.95; color: var(--muted); }

/* ---------- download ---------- */
.releases { display: grid; grid-template-columns: 1.1fr 1fr; gap: 24px; align-items: start; }
.release {
  padding: 34px; border: 1px solid var(--line-strong); border-radius: 14px;
  background: linear-gradient(150deg, rgba(91, 140, 255, .09), rgba(167, 139, 250, .05) 55%, rgba(10, 15, 26, .6));
}
.release--latest { box-shadow: 0 30px 70px -40px rgba(91, 140, 255, .6); }
.release__head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 26px; }
.release__tag { font: 500 8.5px/1 var(--mono); letter-spacing: .16em; color: var(--cyan); }
.release__ver { font: 300 34px/1 var(--mono); letter-spacing: -.02em; color: #f2f5ff; }
.release h3 { margin-bottom: 14px; font-size: 22px; font-weight: 400; color: #f2f5ff; }
.release > p { font-size: 14px; line-height: 1.9; color: var(--muted); }
.release__list { list-style: none; margin: 26px 0 30px; }
.release__list li { position: relative; padding: 9px 0 9px 20px; border-top: 1px solid var(--line); font-size: 12.5px; line-height: 1.8; color: var(--text-2); }
.release__list li::before { content: ""; position: absolute; left: 2px; top: 18px; width: 4px; height: 4px; border-radius: 50%; background: var(--blue-soft); }
.release__actions { display: flex; gap: 10px; flex-wrap: wrap; }
.release__history { display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.hist {
  display: grid; grid-template-columns: 66px 1fr 16px; gap: 16px; align-items: center;
  padding: 20px 4px; border-bottom: 1px solid var(--line);
  color: var(--text-2); text-decoration: none;
  transition: padding .2s, background .2s;
}
.hist:hover { padding-left: 12px; padding-right: 12px; background: rgba(91, 140, 255, .05); }
.hist__ver { font: 400 11px/1 var(--mono); color: var(--blue-soft); }
.hist__body { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.hist__body strong { font-size: 14px; font-weight: 500; color: #f2f5ff; }
.hist__body > span { font-size: 12px; line-height: 1.7; color: var(--muted); }
.hist svg { width: 14px; height: 14px; color: var(--dim); }

/* ---------- developers ---------- */
.dev__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.terminal { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #080c15; }
.terminal__bar {
  display: flex; align-items: center; gap: 14px;
  height: 42px; padding: 0 16px; border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.02);
  font: 400 9px/1 var(--mono); letter-spacing: .1em; color: var(--dim);
}
.terminal__dots { display: flex; gap: 5px; }
.terminal__dots i { width: 7px; height: 7px; border-radius: 50%; background: rgba(146, 174, 226, .25); }
.terminal__dots i:first-child { background: rgba(255, 122, 122, .5); }
.terminal__dots i:nth-child(2) { background: rgba(255, 205, 110, .5); }
.terminal__dots i:last-child { background: rgba(122, 226, 168, .5); }
.terminal__body { margin: 0; padding: 26px 24px 30px; overflow-x: auto; font: 400 12px/1.95 var(--mono); color: var(--text-2); }
.terminal__body code { padding: 0; border: 0; background: none; color: inherit; font: inherit; }
.t-prompt { color: var(--violet); }
.t-key { display: inline-block; width: 74px; color: var(--muted); }
.t-ok { color: #7ee0b8; }

.dev__right { display: flex; flex-direction: column; gap: 26px; }
.dev__structure h3, .dev__commands h3 { margin-bottom: 16px; font: 500 9px/1 var(--mono); letter-spacing: .16em; color: var(--dim); text-transform: uppercase; }
.dev__structure ul { list-style: none; border-top: 1px solid var(--line); }
.dev__structure li { display: grid; grid-template-columns: 190px 1fr; gap: 16px; align-items: baseline; padding: 11px 0; border-bottom: 1px solid var(--line); }
.dev__structure li > span { font-size: 12.5px; line-height: 1.7; color: var(--muted); }
.dev__commands pre { margin: 0 0 14px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 9px; background: #080c15; overflow-x: auto; font: 400 11.5px/2 var(--mono); color: var(--text-2); }
.dev__commands pre code { padding: 0; border: 0; background: none; color: inherit; font: inherit; }
.dev__commands p { font-size: 12px; line-height: 1.9; color: var(--dim); }

.dev__links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 28px; }
.dev-link {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 18px; border: 1px solid var(--line); border-radius: 10px;
  background: rgba(255,255,255,.012); text-decoration: none;
  transition: border-color .2s, background .2s, transform .2s;
}
.dev-link:hover { border-color: rgba(143, 216, 255, .4); background: rgba(91, 140, 255, .07); transform: translateY(-2px); }
.dev-link__body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.dev-link__body strong { font-size: 13.5px; font-weight: 500; color: #f2f5ff; }
.dev-link__body span { font-size: 11px; line-height: 1.6; color: var(--dim); }
.dev-link svg { width: 13px; height: 13px; flex: none; color: var(--dim); }

/* ---------- opensource ---------- */
.opensource .display-2 { margin: 30px 0 46px; max-width: 820px; }
.credits { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.credit {
  position: relative; display: block; padding: 30px;
  border: 1px solid var(--line); border-radius: 12px;
  background: linear-gradient(160deg, rgba(12, 18, 31, .85), rgba(7, 11, 19, .6));
  text-decoration: none; transition: border-color .25s, transform .25s;
}
.credit:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.credit__tag { display: inline-block; margin-bottom: 18px; padding: 5px 9px; border: 1px solid var(--line-strong); border-radius: 4px; font: 400 8px/1 var(--mono); letter-spacing: .1em; color: var(--blue-soft); }
.credit strong { display: block; margin-bottom: 12px; font-size: 24px; font-weight: 400; color: #f2f5ff; }
.credit p { max-width: 420px; font-size: 13px; line-height: 1.9; color: var(--muted); }
.credit__go { position: absolute; right: 26px; top: 26px; font-size: 18px; color: var(--dim); }

.contact {
  display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap;
  margin-top: 22px; padding: 30px; border: 1px solid var(--line); border-radius: 12px;
  background: rgba(255,255,255,.012);
}
.contact__intro { max-width: 620px; }
.contact__intro h3 { margin-bottom: 12px; font-size: 19px; font-weight: 500; color: #f2f5ff; }
.contact__intro p { font-size: 13.5px; line-height: 1.95; color: var(--muted); }
.contact__intro a { color: var(--blue-soft); text-decoration: none; border-bottom: 1px solid rgba(143,180,255,.35); }
.contact__intro a:hover { color: #fff; }
.contact__links { display: flex; gap: 10px; flex-wrap: wrap; }

.license-note { margin-top: 26px; padding: 24px 26px; border-left: 2px solid var(--line-strong); background: rgba(146, 174, 226, .03); }
.license-note p { font-size: 12.5px; line-height: 2; color: var(--muted); }
.license-note strong { color: var(--text-2); font-weight: 500; }
.license-note__small { margin-top: 12px; font-size: 11.5px !important; color: var(--dim) !important; }

/* ---------- footer ---------- */
.footer { padding: 76px 0 40px; border-top: 1px solid var(--line); background: linear-gradient(180deg, rgba(8, 12, 20, .5), #04060b); }
.footer__top { display: grid; grid-template-columns: 1.1fr 1.4fr; gap: 64px; padding-bottom: 56px; }
.footer__mark { width: 34px; height: 34px; border-radius: 8px; object-fit: cover; display: block; margin-bottom: 18px; }
.footer__brand h2 { display: flex; align-items: baseline; gap: 12px; margin-bottom: 18px; font-size: 34px; font-weight: 300; letter-spacing: .04em; }
.footer__brand h2 span { font: 500 8.5px/1 var(--mono); letter-spacing: .22em; color: var(--dim); }
.footer__brand p { font-size: 13px; line-height: 1.9; color: var(--muted); }
.footer__version { display: inline-block; margin-top: 20px; font: 400 9px/1 var(--mono); letter-spacing: .12em; color: var(--dim); }
.footer__nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer__col h3 { margin-bottom: 18px; font: 500 8.5px/1 var(--mono); letter-spacing: .16em; color: var(--dim); text-transform: uppercase; }
.footer__col ul { list-style: none; display: flex; flex-direction: column; gap: 11px; }
.footer__col a { font-size: 13px; color: var(--muted); text-decoration: none; transition: color .2s; }
.footer__col a:hover { color: #fff; }
.footer__bottom {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding-top: 26px; border-top: 1px solid var(--line);
  font: 400 9.5px/1.7 var(--mono); letter-spacing: .04em; color: var(--dim);
}
.footer__fineprint { text-align: right; max-width: 560px; }

/* ---------- to top / noise ---------- */
.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  display: grid; place-items: center; width: 40px; height: 40px;
  border: 1px solid var(--line-strong); border-radius: 10px;
  background: rgba(10, 15, 26, .85); color: var(--text-2);
  cursor: pointer; opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .25s, transform .25s, visibility .25s, border-color .2s;
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--cyan); color: #fff; }
.to-top svg { width: 15px; height: 15px; }
.noise {
  position: fixed; inset: 0; z-index: 400; pointer-events: none; opacity: .018;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* =========================================================
   responsive
   ========================================================= */
@media (max-width: 1080px) {
  .section-head { grid-template-columns: 1fr; gap: 26px; }
  .about__grid { grid-template-columns: 1fr; gap: 28px; }
  .guide__grid { gap: 50px; }
  .feature-wide { gap: 36px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .dev__links { grid-template-columns: repeat(2, 1fr); }
  .nav__menu { gap: 20px; }
  .nav__list { gap: 18px; }
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav__menu {
    position: fixed; top: 72px; left: 0; right: 0; bottom: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 20px var(--pad) 32px; overflow-y: auto;
    background: rgba(5, 7, 13, .99);
    border-bottom: 1px solid var(--line);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: opacity .25s, transform .25s, visibility .25s;
  }
  .nav__menu.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav__link { display: block; padding: 15px 4px; border-bottom: 1px solid var(--line); font-size: 15px; }
  .nav__link::after { display: none; }
  .nav__link--ghost { border-bottom: 0; }
  .nav__cta { height: 44px; margin-top: 22px; }
  .nav__foot { display: block; margin-top: auto; padding-top: 28px; font: 400 8.5px/1.6 var(--mono); letter-spacing: .14em; color: var(--dim); }

  .hero { min-height: 700px; }
  .hero__bottom { flex-direction: column; align-items: flex-start; gap: 26px; }
  .hero__controls { align-items: flex-start; }
  .hero__inner { padding-top: 104px; padding-bottom: 88px; }

  .spec-strip__inner { grid-template-columns: repeat(2, 1fr); }
  .spec { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .spec:nth-child(even) { padding-left: 24px; border-left: 1px solid var(--line); }
  .spec:first-child, .spec:nth-child(2) { border-top: 0; }

  .section { padding: 88px 0; }
  .section-head--split { flex-direction: column; align-items: flex-start; gap: 22px; }
  .section-head--split .section-head__lede { max-width: 620px; }
  .section-head { margin-bottom: 52px; }

  .gallery { gap: 14px; }
  .releases, .dev__grid, .credits { grid-template-columns: 1fr; }
  .guide__grid { grid-template-columns: 1fr; gap: 44px; }
  .footer__top { grid-template-columns: 1fr; gap: 40px; }
  .lightbox__inner { padding: 56px 58px 88px; }
  .lightbox__bar { left: 58px; right: 58px; }
}

@media (max-width: 640px) {
  :root { --pad: 20px; }
  html { scroll-padding-top: 80px; }
  .site-header { height: 64px; }
  .nav__menu { top: 64px; height: calc(100svh - 64px); }
  .brand__mark { width: 27px; height: 27px; }
  .brand__text { font-size: 17px; }
  .brand__en { display: none; }

  .hero { min-height: 680px; height: 100svh; }
  .hero__inner { padding-top: 96px; padding-bottom: 76px; }
  .hero__top { gap: 10px; }
  .version-badge { font-size: 8px; padding: 6px 10px; }
  .hero__lede { font-size: 14px; line-height: 1.9; }
  .hero__actions { gap: 9px; margin-top: 24px; }
  .btn { height: 44px; padding: 0 17px; font-size: 13px; }
  .hero__meta { margin-top: 24px; font-size: 8px; flex-wrap: wrap; gap: 4px 0; }
  .hero__meta li + li::before { margin: 0 9px; }
  .hero__hint { font-size: 8px; }
  .shape { padding: 8px 10px; font-size: 9px; }
  .hero__fallback { top: 21%; font-size: clamp(88px, 26vw, 160px); }
  .hero__ghost { top: 18%; }
  .scroll-cue { bottom: 18px; }

  .section { padding: 74px 0; }
  .display-2 { font-size: clamp(27px, 7.4vw, 34px); line-height: 1.4; }
  .section-head { margin-bottom: 42px; }

  .about__cols { grid-template-columns: 1fr; gap: 20px; margin: 32px 0 38px; }
  .about__cols p { font-size: 14px; }
  .about__cols .lede { font-size: 15.5px; }
  .lineage { grid-template-columns: 1fr; gap: 18px; padding: 22px; }
  .lineage__plus { display: none; }
  .about__facts { grid-template-columns: 1fr; margin-top: 38px; }
  .fact { padding: 20px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .fact:last-child { border-bottom: 0; }
  .fact dd { max-width: none; }

  .feature-wide { grid-template-columns: 1fr; gap: 26px; padding: 34px 0; }
  .feature-wide__copy h3 { font-size: 23px; }
  .feature-wide__copy p { font-size: 14px; }
  .visual-list { grid-template-columns: repeat(3, 1fr); gap: 7px; }
  .visual-list span { min-height: 48px; font-size: 12.5px; }
  .backdrop-list { grid-template-columns: repeat(2, 1fr); }
  .backdrop-list span { height: 74px; }
  .feature-grid { grid-template-columns: 1fr; gap: 12px; margin-top: 30px; }
  .fcard { padding: 22px 20px; }

  .gallery { grid-template-columns: 1fr; }
  .gallery__filters { gap: 6px; }
  .filter { padding: 8px 12px; font-size: 11.5px; }
  .shot figcaption { padding: 13px 15px 16px; }
  .gallery__caption { font-size: 8.5px; }
  .lightbox__inner { padding: 54px 14px 96px; }
  .lightbox__nav { width: 36px; height: 46px; }
  .lightbox__nav--prev { left: 8px; }
  .lightbox__nav--next { right: 8px; }
  .lightbox__close { top: 12px; right: 12px; width: 36px; height: 36px; }
  .lightbox__bar { left: 14px; right: 14px; bottom: 18px; gap: 8px; }
  .lightbox__bar > span:not(.lightbox__count) { font-size: 11px; }
  .lightbox__count { width: 100%; margin-left: 0; }

  .philosophy__quote { margin: 32px 0 52px; font-size: clamp(27px, 8.4vw, 36px); }
  .philosophy__quote::before { margin-bottom: 24px; }
  .principles { grid-template-columns: 1fr; }
  .principle { padding: 22px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .principle:last-child { border-bottom: 0; }
  .principle p { max-width: none; }

  .guide__intro .display-2 { margin: 24px 0 20px; }
  .step { grid-template-columns: 34px 1fr; gap: 12px; padding: 22px 0; }
  .step__body h3 { font-size: 16px; }
  .step__body p { font-size: 13px; }

  .release { padding: 24px 20px; }
  .release__ver { font-size: 28px; }
  .hist { grid-template-columns: 56px 1fr 14px; gap: 10px; padding: 18px 2px; }
  .hist__body strong { font-size: 13px; }

  .terminal__body { padding: 20px 16px; font-size: 10.5px; }
  .t-key { width: 62px; }
  .dev__structure li { grid-template-columns: 1fr; gap: 4px; padding: 12px 0; }
  .dev__links { grid-template-columns: 1fr; }
  .contact { padding: 22px 20px; gap: 22px; }
  .contact__links .btn { height: 40px; font-size: 12px; }

  .footer { padding: 56px 0 92px; }
  .footer__top { padding-bottom: 38px; gap: 34px; }
  .footer__brand h2 { font-size: 28px; }
  .footer__nav { grid-template-columns: 1fr 1fr; gap: 26px; }
  .footer__col:last-child { grid-column: 1 / -1; }
  .footer__bottom { flex-direction: column; gap: 8px; font-size: 9px; }
  .footer__fineprint { text-align: left; }
  .to-top { right: 16px; bottom: 16px; width: 36px; height: 36px; }
}

@media (max-width: 380px) {
  .hero__meta li:last-child { display: none; }
  .hero__meta li + li::before { display: none; }
  .shape { padding: 8px; font-size: 8.5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .to-top { transition: none; }
}